Sorry, I should have been clearer. It's not a technical error message, but a media availability message.
- Contenido no disponible = Content not available
- Recuérdame - se te notificará por correo electrónico cuando esto esté dispnible - "Remind me: you'll be notified by email when this is available".
Lots of other movies on Tubi play just fine in my browser (Zen, mod of Firefox). But 90% of the movies featured on the home page are "Content not available".
Yeah that would be my guess, too. Poor design choices making the user experience very frustrating.